# Indian Numeral System

**Type:** Concept  
**Domain:** indian-mathematics  
**Codex URL:** /mathematics/indian-mathematics/indian-numeral-system/  
**Entry status:** Live — v1.0 (2026-07-09)

## Summary
Place-value decimal system with zero, developed in India c.5th-7th century CE. Transmitted to Islamic world (al-Khwarizmi c.825 CE) and Europe (Fibonacci 1202 CE). The most consequential mathematical contribution in history.

## Sources
- [Tier 1] Brahmagupta (628 CE). Brahmasphutasiddhanta. Trans. Colebrooke 1817.
- [Tier 1] Plofker, K. (2009). Mathematics in India. Princeton University Press.
- [Tier 2] Ifrah, G. (2000). The Universal History of Numbers. Wiley.
- [Tier 3] Kaplan, R. (1999). The Nothing That Is. Oxford University Press.

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*Mathematics Codex entry v1.0 — added 2026-07-09 — thecodex.expert/mathematics/*